oj.uz

Submission #875936

# Submission time Handle Problem Language Result Execution time Memory
875936 2023-11-20T19:16:47 Z 431jericho Tracks in the Snow (BOI13_tracks) C++14
0 / 100
 2000 ms 2736 KB 
#include <bits/stdc++.h>

using namespace std;
#define int long long
#define INF (int)1e18
#define endl '\n'
const int mod = 1000 * 1000 * 1000 + 7;
const int N = 4005;
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

char a[N][N];
queue<pair<int,int> > pq , nq;
int vis[N][N];
int dx[4] = {1,0,-1,0};
int dy[4] = {0,1,0,-1};
void Solve() {
    int n , m; cin>>n>>m;
    for(int i = 1 ;i<= n ; i++){
        for(int j = 1; j<= m ; j++){
            cin>>a[i][j];
        }
    }
    int cnt = 0;
    char c ;
    vis[1][1] = true;
    pq.push({1,1});
    while (!pq.empty()){
        cnt++;
        c = a[pq.front().first][pq.front().second];
        while (!pq.empty())nq.push(pq.front()) , pq.pop();
        while (!nq.empty()){
            auto v = nq.front();
            nq.pop();
            for (int i = 0; i < 4; ++i) {
                int nx = v.first+dx[i], ny = v.second + dy[i];
                if (nx<1 || ny<1 ||nx>n ||ny>m || a[nx][ny]=='.' || vis[nx][ny]){
                    vis[nx][ny] = true;
                    if (a[nx][ny]==c){
                        nq.push({nx,ny});
                    }
                    else{
                        pq.push({nx,ny});
                    }
                }
            }
        }
    }
    cout<<cnt<<endl;
}

int32_t main() {
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(false);
    cin.tie(0);

#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif

    int t = 1;
 //   cin >> t;
    for (int i = 1; i <= t; i++) {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
    return 0;
}

Compilation message

tracks.cpp: In function 'int32_t main()':
tracks.cpp:60:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:61:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |     freopen("out.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2017 ms 2392 KB Time limit exceeded
2 Execution timed out 2054 ms 2396 KB Time limit exceeded
3 Execution timed out 2084 ms 2392 KB Time limit exceeded
4 Execution timed out 2012 ms 2392 KB Time limit exceeded
5 Execution timed out 2025 ms 2392 KB Time limit exceeded
6 Execution timed out 2013 ms 2392 KB Time limit exceeded
7 Execution timed out 2029 ms 2648 KB Time limit exceeded
8 Execution timed out 2066 ms 2396 KB Time limit exceeded
9 Execution timed out 2041 ms 2392 KB Time limit exceeded
10 Execution timed out 2035 ms 2392 KB Time limit exceeded
11 Execution timed out 2020 ms 2392 KB Time limit exceeded
12 Execution timed out 2045 ms 2392 KB Time limit exceeded
13 Execution timed out 2055 ms 2396 KB Time limit exceeded
14 Execution timed out 2050 ms 2396 KB Time limit exceeded
15 Execution timed out 2054 ms 2396 KB Time limit exceeded
16 Execution timed out 2041 ms 2392 KB Time limit exceeded
17 Execution timed out 2041 ms 2552 KB Time limit exceeded
18 Execution timed out 2029 ms 2392 KB Time limit exceeded

Subtask #2
0 / 70.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2063 ms 2396 KB Time limit exceeded
2 Execution timed out 2023 ms 2656 KB Time limit exceeded
3 Execution timed out 2045 ms 2736 KB Time limit exceeded
4 Execution timed out 2035 ms 2396 KB Time limit exceeded
5 Execution timed out 2033 ms 2392 KB Time limit exceeded
6 Execution timed out 2016 ms 2396 KB Time limit exceeded
7 Execution timed out 2053 ms 2396 KB Time limit exceeded
8 Execution timed out 2059 ms 2396 KB Time limit exceeded
9 Execution timed out 2019 ms 2392 KB Time limit exceeded
10 Execution timed out 2041 ms 2396 KB Time limit exceeded
11 Execution timed out 2037 ms 2396 KB Time limit exceeded
12 Execution timed out 2005 ms 2396 KB Time limit exceeded
13 Execution timed out 2060 ms 2396 KB Time limit exceeded
14 Execution timed out 2087 ms 2392 KB Time limit exceeded
15 Execution timed out 2027 ms 2392 KB Time limit exceeded
16 Execution timed out 2035 ms 2392 KB Time limit exceeded
17 Execution timed out 2016 ms 2392 KB Time limit exceeded
18 Execution timed out 2059 ms 2396 KB Time limit exceeded
19 Execution timed out 2044 ms 2392 KB Time limit exceeded
20 Execution timed out 2053 ms 2396 KB Time limit exceeded
21 Execution timed out 2067 ms 2396 KB Time limit exceeded
22 Execution timed out 2052 ms 2396 KB Time limit exceeded
23 Execution timed out 2057 ms 2396 KB Time limit exceeded
24 Execution timed out 2009 ms 2392 KB Time limit exceeded
25 Execution timed out 2070 ms 2648 KB Time limit exceeded
26 Execution timed out 2062 ms 2396 KB Time limit exceeded
27 Execution timed out 2015 ms 2392 KB Time limit exceeded
28 Execution timed out 2027 ms 2392 KB Time limit exceeded
29 Execution timed out 2040 ms 2648 KB Time limit exceeded
30 Execution timed out 2011 ms 2392 KB Time limit exceeded
31 Execution timed out 2031 ms 2392 KB Time limit exceeded
32 Execution timed out 2069 ms 2396 KB Time limit exceeded